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Simplifying 5x + 12 + 7x + 9 = 105 Reorder the terms: 12 + 9 + 5x + 7x = 105 Combine like terms: 12 + 9 = 21 21 + 5x + 7x = 105 Combine like terms: 5x + 7x = 12x 21 + 12x = 105 Solving 21 + 12x = 105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 12x = 105 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = 105 + -21 12x = 105 + -21 Combine like terms: 105 + -21 = 84 12x = 84 Divide each side by '12'. x = 7 Simplifying x = 7
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